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[WebAssembly] Update InstPrinter support for EH
- Updates InstPrinter to handle `catch_all`. - Makes `rethrow` condition an early exit from the function to make the rest simpler. - Unify label and catch counters. They don't need to be counted separately and this will help `delegate` instruction later. - Removes `LastSeenEHInst` field. This was first introduced to handle when there are more than one `catch` blocks per `try`, but this was not implemented correctly and not being used at the moment anyway. - Reenables all tests in cfg-stackify-eh.ll that don't deal with unwind destination mismatches, which will be handled in a later CL. Reviewed By: dschuff, tlively, aardappel Differential Revision: https://reviews.llvm.org/D94043
This commit is contained in:
Heejin Ahn
parent
ecf1f07299
commit
3017c7dd86
@ -94,19 +94,18 @@ void WebAssemblyInstPrinter::printInst(const MCInst *MI, uint64_t Address,
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case WebAssembly::LOOP_S:
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printAnnotation(OS, "label" + utostr(ControlFlowCounter) + ':');
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ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, true));
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break;
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return;
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case WebAssembly::BLOCK:
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case WebAssembly::BLOCK_S:
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ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, false));
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break;
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return;
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case WebAssembly::TRY:
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case WebAssembly::TRY_S:
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ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, false));
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EHPadStack.push_back(EHPadStackCounter++);
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LastSeenEHInst = TRY;
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break;
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ControlFlowStack.push_back(std::make_pair(ControlFlowCounter, false));
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EHPadStack.push_back(ControlFlowCounter++);
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return;
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case WebAssembly::END_LOOP:
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case WebAssembly::END_LOOP_S:
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@ -115,7 +114,7 @@ void WebAssemblyInstPrinter::printInst(const MCInst *MI, uint64_t Address,
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} else {
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ControlFlowStack.pop_back();
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}
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break;
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return;
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case WebAssembly::END_BLOCK:
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case WebAssembly::END_BLOCK_S:
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@ -125,7 +124,7 @@ void WebAssemblyInstPrinter::printInst(const MCInst *MI, uint64_t Address,
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printAnnotation(
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OS, "label" + utostr(ControlFlowStack.pop_back_val().first) + ':');
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}
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break;
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return;
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case WebAssembly::END_TRY:
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case WebAssembly::END_TRY_S:
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@ -134,60 +133,60 @@ void WebAssemblyInstPrinter::printInst(const MCInst *MI, uint64_t Address,
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} else {
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printAnnotation(
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OS, "label" + utostr(ControlFlowStack.pop_back_val().first) + ':');
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LastSeenEHInst = END_TRY;
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}
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break;
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return;
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case WebAssembly::CATCH:
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case WebAssembly::CATCH_S:
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case WebAssembly::CATCH_ALL:
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case WebAssembly::CATCH_ALL_S:
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if (EHPadStack.empty()) {
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printAnnotation(OS, "try-catch mismatch!");
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} else {
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printAnnotation(OS, "catch" + utostr(EHPadStack.pop_back_val()) + ':');
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}
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break;
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}
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return;
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// Annotate any control flow label references.
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// rethrow instruction does not take any depth argument and rethrows to the
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// nearest enclosing catch scope, if any. If there's no enclosing catch
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// scope, it throws up to the caller.
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if (Opc == WebAssembly::RETHROW || Opc == WebAssembly::RETHROW_S) {
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case WebAssembly::RETHROW:
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case WebAssembly::RETHROW_S:
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// 'rethrow' rethrows to the nearest enclosing catch scope, if any. If
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// there's no enclosing catch scope, it throws up to the caller.
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if (EHPadStack.empty()) {
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printAnnotation(OS, "to caller");
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} else {
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printAnnotation(OS, "down to catch" + utostr(EHPadStack.back()));
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}
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return;
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}
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} else {
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unsigned NumFixedOperands = Desc.NumOperands;
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SmallSet<uint64_t, 8> Printed;
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for (unsigned I = 0, E = MI->getNumOperands(); I < E; ++I) {
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// See if this operand denotes a basic block target.
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if (I < NumFixedOperands) {
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// A non-variable_ops operand, check its type.
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if (Desc.OpInfo[I].OperandType != WebAssembly::OPERAND_BASIC_BLOCK)
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continue;
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} else {
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// A variable_ops operand, which currently can be immediates (used in
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// br_table) which are basic block targets, or for call instructions
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// when using -wasm-keep-registers (in which case they are registers,
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// and should not be processed).
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if (!MI->getOperand(I).isImm())
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continue;
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}
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uint64_t Depth = MI->getOperand(I).getImm();
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if (!Printed.insert(Depth).second)
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// Annotate any control flow label references.
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unsigned NumFixedOperands = Desc.NumOperands;
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SmallSet<uint64_t, 8> Printed;
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for (unsigned I = 0, E = MI->getNumOperands(); I < E; ++I) {
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// See if this operand denotes a basic block target.
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if (I < NumFixedOperands) {
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// A non-variable_ops operand, check its type.
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if (Desc.OpInfo[I].OperandType != WebAssembly::OPERAND_BASIC_BLOCK)
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continue;
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if (Depth >= ControlFlowStack.size()) {
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printAnnotation(OS, "Invalid depth argument!");
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} else {
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const auto &Pair = ControlFlowStack.rbegin()[Depth];
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printAnnotation(OS, utostr(Depth) + ": " +
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(Pair.second ? "up" : "down") + " to label" +
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utostr(Pair.first));
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}
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} else {
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// A variable_ops operand, which currently can be immediates (used in
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// br_table) which are basic block targets, or for call instructions
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// when using -wasm-keep-registers (in which case they are registers,
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// and should not be processed).
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if (!MI->getOperand(I).isImm())
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continue;
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}
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uint64_t Depth = MI->getOperand(I).getImm();
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if (!Printed.insert(Depth).second)
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continue;
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if (Depth >= ControlFlowStack.size()) {
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printAnnotation(OS, "Invalid depth argument!");
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} else {
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const auto &Pair = ControlFlowStack.rbegin()[Depth];
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printAnnotation(OS, utostr(Depth) + ": " +
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(Pair.second ? "up" : "down") + " to label" +
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utostr(Pair.first));
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}
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}
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}
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@ -25,13 +25,9 @@ class MCSubtargetInfo;
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class WebAssemblyInstPrinter final : public MCInstPrinter {
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uint64_t ControlFlowCounter = 0;
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uint64_t EHPadStackCounter = 0;
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SmallVector<std::pair<uint64_t, bool>, 4> ControlFlowStack;
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SmallVector<uint64_t, 4> EHPadStack;
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enum EHInstKind { TRY, CATCH, END_TRY };
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EHInstKind LastSeenEHInst = END_TRY;
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public:
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WebAssemblyInstPrinter(const MCAsmInfo &MAI, const MCInstrInfo &MII,
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const MCRegisterInfo &MRI);
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@ -1,8 +1,8 @@
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; REQUIRES: asserts
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; TODO Reenable disabled lines after updating the backend to the new spec
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; R UN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling | FileCheck %s
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; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling | FileCheck %s
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; RUN: llc < %s -disable-wasm-fallthrough-return-opt -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling
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; R UN: llc < %s -O0 -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -verify-machineinstrs -exception-model=wasm -mattr=+exception-handling | FileCheck %s --check-prefix=NOOPT
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; RUN: llc < %s -O0 -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -verify-machineinstrs -exception-model=wasm -mattr=+exception-handling | FileCheck %s --check-prefix=NOOPT
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; R UN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling -wasm-disable-ehpad-sort | FileCheck %s --check-prefix=NOSORT
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; R UN: llc < %s -disable-wasm-fallthrough-return-opt -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling -wasm-disable-ehpad-sort | FileCheck %s --check-prefix=NOSORT-LOCALS
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; R UN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -disable-block-placement -verify-machineinstrs -fast-isel=false -machine-sink-split-probability-threshold=0 -cgp-freq-ratio-to-skip-merge=1000 -exception-model=wasm -mattr=+exception-handling -wasm-disable-ehpad-sort -stats 2>&1 | FileCheck %s --check-prefix=NOSORT-STAT
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@ -43,7 +43,7 @@ target triple = "wasm32-unknown-unknown"
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; CHECK: call __cxa_end_catch
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; CHECK: br 1 # 1: down to label[[L1]]
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; CHECK: end_block # label[[L2]]:
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; CHECK: rethrow {{.*}} # to caller
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; CHECK: rethrow 0 # to caller
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; CHECK: end_try # label[[L1]]:
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define void @test0() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
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entry:
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@ -118,19 +118,19 @@ try.cont: ; preds = %catch, %catch2, %en
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; CHECK: br 2 # 2: down to label[[L3:[0-9]+]]
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; CHECK: catch
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; CHECK: call __cxa_end_catch
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; CHECK: rethrow {{.*}} # down to catch[[C0:[0-9]+]]
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; CHECK: rethrow 0 # down to catch[[C0:[0-9]+]]
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; CHECK: end_try
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; CHECK: end_block # label[[L2]]:
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; CHECK: rethrow {{.*}} # down to catch[[C0]]
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; CHECK: catch {{.*}} # catch[[C0]]:
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; CHECK: rethrow 0 # down to catch[[C0]]
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; CHECK: catch_all # catch[[C0]]:
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; CHECK: call __cxa_end_catch
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; CHECK: rethrow {{.*}} # to caller
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; CHECK: rethrow 0 # to caller
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; CHECK: end_try # label[[L3]]:
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; CHECK: call __cxa_end_catch
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; CHECK: br 2 # 2: down to label[[L1]]
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; CHECK: end_try
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; CHECK: end_block # label[[L0]]:
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; CHECK: rethrow {{.*}} # to caller
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; CHECK: rethrow 0 # to caller
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; CHECK: end_block # label[[L1]]:
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; CHECK: call __cxa_end_catch
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; CHECK: end_try
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@ -237,7 +237,7 @@ unreachable: ; preds = %rethrow5
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; CHECK: call __clang_call_terminate
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; CHECK: unreachable
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; CHECK: end_try
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; CHECK: rethrow {{.*}} # to caller
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; CHECK: rethrow 0 # to caller
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; CHECK: end_try
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; CHECK: end_block # label[[L1]]:
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; CHECK: call __cxa_end_catch
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@ -658,7 +658,7 @@ try.cont: ; preds = %catch.start
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; NOSORT: br_on_exn 0, {{.*}} # 0: down to label[[L2:[0-9]+]]
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; --- Nested try/catch/end_try starts
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; NOSORT: try
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; NOSORT: rethrow {{.*}} # down to catch[[C0:[0-9]+]]
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; NOSORT: rethrow 0 # down to catch[[C0:[0-9]+]]
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; NOSORT: catch $[[REG1:[0-9]+]]= # catch[[C0]]:
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; NOSORT: br 5 # 5: down to label[[L3:[0-9]+]]
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; NOSORT: end_try
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@ -24,8 +24,7 @@ test_annotation:
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block
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try
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br 0
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catch __cpp_exception
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local.set 0
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catch_all
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end_try
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end_block
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rethrow 0
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@ -45,13 +44,12 @@ test_annotation:
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# CHECK-NEXT: end_loop
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# CHECK-NEXT: end_block # label1:
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# CHECK-NEXT: try
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# CHECK-NEXT: rethrow 0 # down to catch1
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# CHECK-NEXT: catch __cpp_exception # catch1:
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# CHECK-NEXT: rethrow 0 # down to catch3
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# CHECK-NEXT: catch __cpp_exception # catch3:
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# CHECK-NEXT: block
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# CHECK-NEXT: try
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# CHECK-NEXT: br 0 # 0: down to label5
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# CHECK-NEXT: catch __cpp_exception # catch2:
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# CHECK-NEXT: local.set 0
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# CHECK-NEXT: catch_all # catch5:
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# CHECK-NEXT: end_try # label5:
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# CHECK-NEXT: end_block # label4:
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# CHECK-NEXT: rethrow 0 # to caller
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